This paper reports the preparation of 3D ordered porous SnO2 with different diameters (103, 546, and 1030[Formula: see text]nm) by a simple template method. We find that 103[Formula: see text]nm porous SnO2 nanomaterials have the highest response (30) and fastest response/recovery time (3/10 s) for 100 ppm HCHO (formaldehyde) compared with the response and response/recovery times for 546 nm (20 and 3/17[Formula: see text]s, respectively) and 1030 nm (10 and 6/20[Formula: see text]s, respectively) porous SnO2 nanomaterials at a low working temperature (220∘C). All three sensors show good long-term stability, repeatability, and linearity. The results show that decreasing the diameter of the porous SnO2 materials effectively increased the gas sensitivity to HCHO. The increase in the gas sensitivity was attributed to the ordered porous structures, large specific surface area, and additional oxygen vacancies on the surface.

中文翻译：

---

具有可控孔径的 3D 有序多孔 SnO2，可增强甲醛传感性能

本文报道了 3D 有序多孔 SnO 的制备2通过简单的模板方法，具有不同直径（103、546 和 1030[公式：见正文]nm）。我们发现 103[公式：见正文]nm 多孔 SnO2与 546 nm（20 和 3/17）的响应和响应/恢复时间相比，纳米材料对 100 ppm HCHO（甲醛）具有最高响应 (30) 和最快响应/恢复时间 (3/10 s) [公式：见正文]s）和 1030 nm（分别为 10 和 6/20[公式：见正文]s）多孔 SnO2纳米材料在低工作温度（220∘C）。所有三个传感器都显示出良好的长期稳定性、可重复性和线性度。结果表明，减小多孔 SnO 的直径2材料有效地增加了对 HCHO 的气体敏感性。气体敏感性的增加归因于有序的多孔结构、大的比表面积和表面上额外的氧空位。